Core for casting pipe.



' Patenten ont. 3|, |899.

A. SCHIEFEH.

CORE FOR CASTING PIPE.

(Appicaton led Sept. 2, 1898.)

(No Model.)

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i NiTnD STATES PATENT Erice.

ANDREW SOI-IIEFER, OF FERNBANK, OHIO.

CORE FOR CASTING PIPE.

SPECIFICATION forming part of Letters Patent No. 635,900, dated October 31, 18991.

Application tiled September 2, 1898. Serial No. 690,075. (No model.)

To @ZZ whom it may concern.-

Be it known that I, ANDREW SCHIEFER, residing at Fernbank, in the county of Hamil ton and State of Ohio, have invented certain new and useful Improvements in Cores for Casting Pipe, of which the following is a speciiication.

My invention relates to cores for casting pipe.

The features of my invention will be more fully set forth in the description of the accompanying drawings, making a part of this speciiication, in which-' Figure 1 is a plan view of an apparatus and core-bar in position for forming the core. Fig. 2 is a 4sectional elevation of Fig. l, showing the core partly completed. Fig. 3 is a similar section showing the formation of the crust. Fig. et is a cross-section of the completed core on the core-bar.

A' A represent bearing-posts in which is journaled the hollow perforated core-bar A, secured upon the shaft a.

E represents a table. This table E is supported upon the shelf H and is adjustable to and from the core-bar by means of different thicknesses of filling-strips e, interposed between the table or truing-board and the backsupport I. v

The core-bar A is of the ordinary construction. The perforations therein perform two offices-first, they allow the escape through the porous combustible material of gases forming in the core-layer, and, second, they form anchors for holding the material in place until thoroughly dried. The coating or inner layer B is formed of a composition of loam or clay and sawdust or other fine combustible material, which are thoroughly united and mixed, preferably by being ground in a mill.

The coating applied to the finished core-bar is formed of three layers. The rst layer of loam or clay and sawdust is mixed or applied in either of two ways. The first method is as follows: I take eight parts of clay, thirty-two parts sawdust, and one part molasses, sugar, or its equivalent, adding water enough to make the mass plastic, and thoroughly mix the same. The perforated core-baris mounted upon a shaft and the above-described compost applied by means of a truing and compressing board or table E, as illustrated in Fig. 2, It will be observed that the front edge of this board is vertical and that it extends up and downward from the axial line n of the core-bar. As the core-bar is revolved the compost is compressed between the edge of the board and the rotating bar. This forces the material somewhat through the perforations of the core-bar; but, what is more material, it compresses or makes the same compact about the periphery of the core-bar. After this coating is applied it is baked or heated. This baking process causes the molasses, sugar, or its equivalent to come to the surface and harden or caramelize and form a crust C. This crust is an essential feature, as will be hereinafter explained. The second method of applying this layeris as follows: The mo lasses is omitted and the mass is made plastic by water alone, and after it has been applied to the core-bar then a coating of molasses, sugar, or its equivalent dissolved in water is applied to the outer periphery and the core is baked or dried sufficiently to form a caramelized crust of the molasses or other similar material employed for such purpose. After the crust has been formed upon the inner layer the usual layer of loam is applied upon the incrusted inner layer, and the core thus formed is dried the same as the ordinary core built upon a rope of dried hay, which is now in known use.

When the metal is cast around the core, the heat of the metal burns the sawdust forming part'of the inner layer, so as to admit of the withdrawal of the core-bar as soon as the metal sets. The sawdust orinner layer serves the same purpose as the hay rope in common use.

The crust formed upon the inner layer of the core is impervious to moisture, and thereby prevents the moisture of the last or nisli coat from penetrating into the combustible material, which in a wet state would not support the said last coating. The outer layer D is preferably applied by the compressing or truing board shown in the drawings, as it is material in causing it to adhere to the incrusted inner layer. -Vithout such crust upon the inner layer it would soften and fall oif.

The thickness of the coating applied by IOO means of the truing and compressing board of course depends upon the spaee between the board and core-bar on the line n. This may be increased or decreased by the adjustment of said board. As one means of aecomplishing this I provide adj listing-strips e between the edge of said truing-board E and the back board I, said strip resting on the shelf H. These strips are changed, thicker and thinner pieces being used, as occasion requil-es.

I do not Wish to limit myself to the use of molasses in forming the crust upon the inner layer, as other similar earbonaeeous material, such as sugar, the., may be employed for this purpose; but Ideem the molasses the cheapest and the best.

IIaving described my invention, what I claim is- A core for casting hollow articles consisting zo of a metal core-bar, a primary baked layer of mixed clay and carbonaceous material in the form of a dry, inflammable compost, a second layer of caramelized sugar on the exterior snrface of said first layer, and a third layer of 25 loam on said caramelized layer, substantially as and for the purposes specified.

In testimony whereof I have hereunto set my hand.

ANDREV SCIIIEFER.

Witnesses:

OLIVER B. KAISER, W. R. Woon. 

